Ahmad, Sohail Yadav, Kumar Karitkey Bhattacharya, Soumee Chauhan, Prashant M. S. Chauhan, S. Synthesis of 21,23-Selenium- and Tellurium-Substituted 5‑Porphomethenes, 5,10-Porphodimethenes, 5,15-Porphodimethenes, and Porphotrimethenes and Their Interactions with Mercury The 3+1 condensation of symmetrical 16-Selena/telluratripyrranes with symmetrical selenophene-2,5-diols/tellurophene-2,5-diols in the presence of BF<sub>3</sub>-etheratre or BF<sub>3</sub>-methanol followed by oxidation with DDQ gave 5,10-porphodimethenes, whereas the process with unsymmetrical selenophene-2,5-diols/tellurophene-2,5-diols gave 5-porphomethenes. In addition, the reaction of unsymmetrical 16-Selena/telluratripyrranes with symmetrical selenophene-2,5-diols/tellurophene-2,5-diols gave the corresponding porphotrimethenes, whereas the process with unsymmetrical selenophene-2,5-diols/tellurophene-2,5-diols gave the 5,15-porphodimethenes. The structures of different products were characterized by IR, <sup>1</sup>H and <sup>13</sup>C NMR, <sup>1</sup>H–<sup>1</sup>H COSY, CHN analysis, and mass spectrometry. The binding of mercury with the calix[4]­phyrins mentioned above had been observed in the decreasing order of porphodimethenes > porphomethenes > porphotrimethenes by UV–vis and <sup>1</sup>H NMR spectroscopy. 1 H NMR spectroscopy;BF;unsymmetrical;mass spectrometry;COSY;selenophene;13 C NMR;Selena;CHN analysis;DDQ;IR;Porphodimethene;porphomethene;UV;1 H;porphodimethene;porphotrimethene 2015-04-17
    https://acs.figshare.com/articles/journal_contribution/Synthesis_of_21_23_Selenium_and_Tellurium_Substituted_5_Porphomethenes_5_10_Porphodimethenes_5_15_Porphodimethenes_and_Porphotrimethenes_and_Their_Interactions_with_Mercury/2175505
10.1021/acs.joc.5b00007.s001